Sadly, it does sound like your display got the worse of it. Let’s do a bit more testing, aim a flashlight though the lids Apple Logo do you see the faint image of your desktop and its icons? If you do then the backlight logic needs repairs, other wise the LCD panel is broken and you’ll need to replace the display assembly. This series is still highly sought! Here’s one source for the needed part [https://www.thebookyard.com/parts-retina-macbook-pro-13.php?cPath=39_367_393&sort=2a&filter_id=14|13” MacBook Pro Display Assembly] Here you can see there are a few options for the part new to used from Grade-A to Grade-C each at different costs.